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Tabulations
History categories
- h1 an account is given since it was found and left the ground.
- h2 known at a date up to 1914.
- h3 known in the period 1915-1944.
- h4 known in the period 1945-1973.
- h5 known in the period 1974-1986.
- h6 known in the period 1987 onwards.
- h7 surfaced on this occasion.
- h8 date of surfacing not known to us.
- h9 date of surfacing uncertain.
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